package com.example.tablet;

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import com.example.tablet.dummy.DummyContent;

/**
 * A list fragment representing a list of Items. This fragment also supports
 * tablet devices by allowing list items to be given an 'activated' state upon
 * selection. This helps indicate which item is currently being viewed in a
 * {@link ItemDetailFragment}.
 * <p>
 * Activities containing this fragment MUST implement the {@link Callbacks}
 * interface.
 */
public class ItemListFragment extends ListFragment {

	/**
	 * The serialization (saved instance state) Bundle key representing the
	 * activated item position. Only used on tablets.
	 */
	private static final String STATE_ACTIVATED_POSITION = "activated_position";

	/**
	 * The fragment's current callback object, which is notified of list item
	 * clicks.
	 */
	private Callbacks mCallbacks = sDummyCallbacks;

	/**
	 * The current activated item position. Only used on tablets.
	 */
	private int mActivatedPosition = ListView.INVALID_POSITION;

	/**
	 * A callback interface that all activities containing this fragment must
	 * implement. This mechanism allows activities to be notified of item
	 * selections.
	 */
	public interface Callbacks {
		/**
		 * Callback for when an item has been selected.
		 */
		public void onItemSelected( String id );
	}

	/**
	 * A dummy implementation of the {@link Callbacks} interface that does
	 * nothing. Used only when this fragment is not attached to an activity.
	 */
	private static Callbacks sDummyCallbacks = new Callbacks() {
		@Override
		public void onItemSelected( String id ) {}
	};

	/**
	 * Mandatory empty constructor for the fragment manager to instantiate the
	 * fragment (e.g. upon screen orientation changes).
	 */
	public ItemListFragment() {}

	@Override
	public void onCreate( Bundle savedInstanceState ) {
		super.onCreate( savedInstanceState );

		// TODO: replace with a real list adapter.
		setListAdapter( new ArrayAdapter<DummyContent.DummyItem>( getActivity(), android.R.layout.simple_list_item_activated_1, android.R.id.text1, DummyContent.ITEMS ) );
	}

	@Override
	public void onViewCreated( View view, Bundle savedInstanceState ) {
		super.onViewCreated( view, savedInstanceState );

		// Restore the previously serialized activated item position.
		if ( savedInstanceState != null && savedInstanceState.containsKey( STATE_ACTIVATED_POSITION ) ) {
			setActivatedPosition( savedInstanceState.getInt( STATE_ACTIVATED_POSITION ) );
		}
	}

	@Override
	public void onAttach( Activity activity ) {
		super.onAttach( activity );

		// Activities containing this fragment must implement its callbacks.
		if ( !( activity instanceof Callbacks ) ) {
			throw new IllegalStateException( "Activity must implement fragment's callbacks." );
		}

		mCallbacks = (Callbacks) activity;
	}

	@Override
	public void onDetach() {
		super.onDetach();

		// Reset the active callbacks interface to the dummy implementation.
		mCallbacks = sDummyCallbacks;
	}

	@Override
	public void onListItemClick( ListView listView, View view, int position, long id ) {
		super.onListItemClick( listView, view, position, id );

		// Notify the active callbacks interface (the activity, if the
		// fragment is attached to one) that an item has been selected.
		mCallbacks.onItemSelected( DummyContent.ITEMS.get( position ).id );
	}

	@Override
	public void onSaveInstanceState( Bundle outState ) {
		super.onSaveInstanceState( outState );
		if ( mActivatedPosition != ListView.INVALID_POSITION ) {
			// Serialize and persist the activated item position.
			outState.putInt( STATE_ACTIVATED_POSITION, mActivatedPosition );
		}
	}

	/**
	 * Turns on activate-on-click mode. When this mode is on, list items will be
	 * given the 'activated' state when touched.
	 */
	public void setActivateOnItemClick( boolean activateOnItemClick ) {
		// When setting CHOICE_MODE_SINGLE, ListView will automatically
		// give items the 'activated' state when touched.
		getListView().setChoiceMode( activateOnItemClick ? ListView.CHOICE_MODE_SINGLE : ListView.CHOICE_MODE_NONE );
	}

	private void setActivatedPosition( int position ) {
		if ( position == ListView.INVALID_POSITION ) {
			getListView().setItemChecked( mActivatedPosition, false );
		} else {
			getListView().setItemChecked( position, true );
		}

		mActivatedPosition = position;
	}
}
